The Allison V-1710 was the only U.S.
liquid-cooled production engine of World War II and the first engine
designed from the start to use ethylene glycol (prestone) coolant.

Design began in 1930 to replace the Maybach engines used
by the U.S. Navy's airships. The contract was cancelled before the first
engine was delivered after the airship Macon crashed in 1935. A
redesigned engine passed its type-test in 1937 at 1,000 hp. Flight tests
led the U.S. Army to push the use of the V-1710 in its new generation of
fighters.

Lack of an adequate supercharger inhibited high-altitude
performance; however, around 47,000 were built by the end of World War II.